CAJ | 학술논문

为研究交联聚乙烯(XLPE)电缆中水树区域介电常数与电场特性的关系，采用水针电极、高频高压对交联聚乙烯电缆试样进行加速水树老化实验，通过显微镜观察水树形态，根据观察到的水树形态构建有限元仿真模型，仿真分析水树区域介电常数变化对水树周围电场强度的影响规律。结果表明：当水树区域相对介电常数或电导率增加时，水树末梢的场强增大，而针尖场强减小，水树末梢尖端易成为电树引发的起点；当水树区域相对介电常数或电导率减小时，针尖场强增大，而水树末梢的场强减小，针尖易成为电树引发的起点。
위연구교련취을희(XLPE)전람중수수구역개전상수여전장특성적관계，채용수침전겁、고빈고압대교련취을희전람시양진행가속수수노화실험，통과현미경관찰수수형태，근거관찰도적수수형태구건유한원방진모형，방진분석수수구역개전상수변화대수수주위전장강도적영향규률。결과표명：당수수구역상대개전상수혹전도솔증가시，수수말소적장강증대，이침첨장강감소，수수말소첨단역성위전수인발적기점；당수수구역상대개전상수혹전도솔감소시，침첨장강증대，이수수말소적장강감소，침첨역성위전수인발적기점。
To study the relationship between dielectric constant and electric field characteristics of water tree region in XLPE cable, we used water-needle electrode and high-frequency and high-voltage to do water tree accelerated ageing experiment for the XLPE cable samples. The morphology of water tree was observed by microscope, a finite element simulation model was constructed based on the observed morphology of water tree, and the effect of dielectric constant of water tree region on the electric field strength surrounding the water tree was analyzed. The results show that when the relative dielectric con-stant or the conductivity increases, the electric field strength of water tree endings increases, the electric field strength of needle tip decreases, and the water tree endings can easily become the starting point ini-tiating electrical tree. When the relative dielectric constant or the conductivity decreases, the electric field strength of needle tip increases, the electric field strength of water tree endings decreases, and the needle tip can easily become the starting point initiating electrical tree.